Microstructure and mechanical behavior of Pt-modified NiAl diffusion coatings
| Autor: | J. Riethmueller, Gerhard Dehm, E. E. Affeldt, Eduard Arzt |
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| Rok vydání: | 2006 |
| Předmět: |
Nial
Materials science Diffusion Metals and Alloys Substrate (electronics) engineering.material Condensed Matter Physics Microstructure Thermal barrier coating Coating Phase (matter) Materials Chemistry engineering Forensic engineering Physical and Theoretical Chemistry Composite material Ductility computer computer.programming_language |
| Zdroj: | International Journal of Materials Research. 97:689-698 |
| ISSN: | 2195-8556 1862-5282 |
| DOI: | 10.3139/146.101291 |
| Popis: | The performance of thermal barrier coatings (TBCs) in jet engines is strongly influenced by thermal and mechanical properties of the bond coat. In this investigation two different types of Pt-modified diffusion coatings developed for application as oxidation protection or as a bond coat in TBC systems were studied with respect to their microstructure and mechanical properties. The microstructural analyses based on different microscopy techniques and X-ray diffraction measurements revealed distinct differences between the two coatings: the coating aluminized by a gas phase process consisted solely of a (NiPt)Al phase, while the coating fabricated by pack-cementation consisted mainly of the two phases (NiPt)Al and Al2Pt, leading to a higher strength in comparison with the single-phase coating. In contrast, the ductility determined with 3-point bend tests between room temperature and 700°C was clearly better for the single-phase coating. Additionally, the substrate curvature of coated sheets was measured to gain some information about coating stresses. |
| Databáze: | OpenAIRE |
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